The New Crystalline Modification of Na-Cellulose, Vl, and the Retention of Original Crystalline Structure

Abstract

The new crystalline modification of Na-Cellulose (Na-Cell) was obtained from Na-Cell I via Na-Cell M by drying it at room temperature, and named Na-Cell VI.
Na-Cell VI was also obtained directly from Na-Cell 1 by heating it at 180-200 C. Na-Cell VI is a more stable modification than Na-Ce11 IIIand gives more distinct X-ray diagram. Na-Cell III and VI derived from Cellulose I through Na-Cell I I atrd those from Cellulose II through Na-Cell I ll are different in their X-ray diagrams, especialy in the intensity ratio of 1(020)/1(040), and therefore Na-Cell III I and VI are distinguished from Na-Cell III II and VI II. Na-Cell M i and VI I are regenerated to Cellulose I by decomposition with hot water. Namely, they retain their original crystalline structure. It is considered that the chain configulation of Cellulose I does't change during mercerizatio: n or drying and remains in Na-Cell I I, III and VI I. The composition of Na-Cell VI was determined to be 1 C6HieOs.1NaOH.